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y in (-oo:+oo)
(1/6)*(6*y+12)-9 = (-1/4)*(12*y-20) // - (-1/4)*(12*y-20)
(1/6)*(6*y+12)-((-1/4)*(12*y-20))-9 = 0
(1/6)*(6*y+12)+(1/4)*(12*y-20)-9 = 0
1/6*(6*y+12)+1/4*(12*y-20)-9 = 0
1/6*(6*y+12)+1/4*(12*y-20)-9 = 0
4*y-9-3 = 0
4*y-12 = 0
4*y-12 = 0
4*y-12 = 0 // + 12
4*y = 12 // : 4
y = 12/4
y = 3
y = 3
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